AES mix columns
This instruction reads a 16-byte state array from each 128-bit segment of the source register, and performs a single round of the MixColumns() transformation on each state array in accordance with the AES standard. Each updated state array is destructively placed in the corresponding segment of the first source vector. This instruction is unpredicated.
ID_AA64ZFR0_EL1.AES indicates whether this instruction is implemented.
This instruction is legal when executed in Streaming SVE mode if one of the following is true:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Zdn | ||||
| size | op | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE_AES) then EndOfDecode(Decode_UNDEF); end; let dn : integer = UInt(Zdn);
| <Zdn> |
Is the name of the source and destination scalable vector register, encoded in the "Zdn" field. |
if IsFeatureImplemented(FEAT_SSVE_AES) then CheckSVEEnabled(); else CheckNonStreamingSVEEnabled(); end; let VL : integer{} = CurrentVL(); let segments : integer = VL DIV 128; let operand : bits(VL) = Z{}(dn); var result : bits(VL); for s = 0 to segments-1 do result[s*:128] = AESMixColumns(operand[s*:128]); end; Z{VL}(dn) = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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